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These tumors connect to the organs through either a peduncular attachment (Fig. 1A) or a direct adherence of tumor cells to the adventitial layer of the organ. As tumors on the diaphragm increase in size, larger, compact spheroids develop from dome-shaped aggregates on the basal region, while bush-like tumors with an appearance reminiscent of papillomatous adenomas form in the upper regions of the tumor. This dichotomous morphology appears to be directly proportional to the size of the tumors. This phenomenon is best illustrated in Fig. 1B where a tumor shows large, superficial dome region composed of an adenocarcinomatous mass separated by a space from the basal dome-shaped tumor mass from which https://www.selleckchem.com/products/Temsirolimus.html it originated. Following the attachment of the DU145 cells to the mesothelium, initial tumor growth is into the peritoneal cavity because tumor invasion is restricted by the mesothelial basement membrane and its submesothelial connective tissue. Hematoxylin and eosin staining of tumor sections revealed a population of large, https://www.selleckchem.com/products/DMXAA(ASA404).html basophilic DU145 cells disseminated along the basal zone of the tumor masses above the submesothelial areas, which may be responsible for invasion of the tumors (Fig. 1B). Subsequently, these basophilic cells develop into small nests, clusters and then nodules, which invade the submesothelial region and the muscle stroma (Gilloteaux et al., 2012, submitted for publication). In at least two of the mice, these tumor cells invaded the entire width of the diaphragm and eventually reached the pleural cavity. Other clumps of tumor cells, entered lymph vessels and were disseminated to other body sites. Upon scanning electron microscopic (SEM) examination, the mesothelium of the diaphragm appears similar to that described in humans and most vertebrates. The peritoneal surfaces are covered by a single layer of mesothelial cells with a uniform morphologic population resembling paving stones that give these surfaces a typical cobblestone aspect (Figs. 2A, 3A�CD, 4A,B). The typical mesothelial lining the liver (Fig. 2A,C,D) and other peritoneal surfaces show homogeneous, flat to low cuboidal squamous cells coated by short to punctate microvilli https://en.wikipedia.org/wiki/I%CE%BAB%CE%B1 (h